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Concrete pier - so cheap & effective

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#1 Mark Radice

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Posted 03 September 2021 - 12:43 AM

I can’t believe how much metal piers cost! Looking online they are several hundreds of pounds.

While I am sure they are robust, I made my bombproof concrete pier for just over £100 in materials. It easily takes a C11 on an EQ6 without breaking a sweat.

That being said, now it is concreted into the ground, I cannot take mine with me if and when we move house. This is the true benefit of a metal pier. When we do move, I shall simply pour a new one, wherever that may be.

Measurements are 1.2m tall x 0.3x0.3m square with M20 bolts supporting the top plate. It took a day to prep the shed and make the wooden framing (with hindsight, I should have bought a length of scrap air conditioning duct) and a morning to pour the cement.

Thank goodness my friend, Ian, who has an observatory in Bath was able to bring his mixer and lead the show as I have never mixed concrete before. Thanks, Ian.

The first few buckets were wet and, with a rebar cage, ensured a good bond to the concrete floor. It isn’t going anywhere!

The bolts for the top plate were put in the cement while it was cured but I added further bonding with the rawl-plug epoxy (whatever it is called!) as belts and braces.

After a week of curing, it is now loaded up waiting for clear skies. Hurrah!

Full build - including using cup of tea to check the level is here: https://youtu.be/zUSMDIDESlQ
  • elpajare, OldManSky and DSOGabe like this

#2 macdonjh

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Posted 03 September 2021 - 08:36 AM

I don't know how to weld, so I also am thankful for concrete.  I was also able to easily put conduit in my pier so my cables run under my observatory floor and through my pier.  No cables on the floor.

 

You guys did a good job minimizing honeycomb (those "holes" in the side of the concrete).  I was going to suggest using mortar to point the holes, but I saw later you'd filled them with resin.


Edited by macdonjh, 03 September 2021 - 08:43 AM.


#3 OldManSky

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Posted 03 September 2021 - 06:37 PM

"...including using cup of tea to check the level..."

So British :)

And nicely done!

 

My concrete pier was significantly less costly than £100.  $32 in concrete, $6 in rebar, $8 for sonotube.

If I move (doubtful!), I'll pour another.




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